Improvement in ventilators



A. J. ROBINSON.

VENTILATOR.

Patente-d May 9,1876'.

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NJETERS. PHOTO-LITHOGRAPNER. WASHINGTONy D C.

UNITED STATES `PATENT OFFICE. l

ANDREW J. ROBINSON, OF TROY, NEW YORK.

IMPROVEMENT IN VENTILATORS.

Specification forming part of Letters Patent No. 12"2',280,A dated May 9, 1876 application led April 8, 1876.

To all whom it may concern:

Be it known that I, ANDREW J. ROBINSON, of Troy, in the county of Rensselaer and State of New York, have invented a new and valuable Improvement in Ventilators; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

The gure l of the drawings is a representation of a transverse vertical section.

The nature of my invention consists in the construction and arrangement of a ventilator as an improvement upon a similar device for which Letters Patent have been recently granted to me.

. In the annexed drawing, A represents the top dome and B the lower dome, which latter is provided at the. bottom with a pipe or col lar, C. At the top edge of the lower dome B, and at the bottom edge of the upper dome A, are projecting flanges a a, which may be either straight or curved, and the two domes are separated by means of brackets D D. These l. In a ventilator, having top and bottom l domes A B, the flanges a a, projecting from the edges of both domes, as shown and described.

2. 'lhe brackets D D, constructed as shown,

in combination with the domes A B and surrounding shield Gr, substantially'as herein set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

J. B. SINsAEAUeH, Gr. H. PERRY. 

